Colorado 2WD V8-5.3L (2009)
Engine Control Module: Service and Repair
Engine Control Module Replacement
Service of the engine control module (ECM) should normally consist of either replacement of the ECM or electrically erasable programmable read only
memory (EEPROM) programming. If the diagnostic procedures call for the ECM to be replaced, the ECM should be inspected first to see if the correct
part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM.
Caution:
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Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control
module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module
fuse, jumper cables, etc.) in order to prevent internal control module damage.
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Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery
voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
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In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components
on the circuit board.
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Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector
gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion
into the control module.
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The replacement control module must be programmed.
Note: It is necessary to record the remaining engine oil life. If the replacement module is not programmed with the remaining engine oil life, the engine
oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be
changed at 5 000 km (3,000 mi) from the last engine oil change.
Removal Procedure
1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
2. Remove the windshield washer solvent container. Refer to Windshield Washer Solvent Container Replacement (See: Wiper and Washer
Systems/Windshield Washer Reservoir/Service and Repair).
3. Disengage the integral connector position assurance (CPA) retainer (1) on the body wiring harness electrical connector.
4. Disconnect the body wiring harness electrical connector (2) from the ECM.
